Check the listing for details. Topeak Zi:RAK Thru-Axle with Integrated Mounting Platform - Lightweight. Condition: New. Listed at 39.95 USD. The Topeak Zi:RAK Thru Axle replaces standard thru axles with an integrated mounting platform for Zi:RAK accessories. The hollow aluminum construction maintains structural strength while adding functionality to the front or rear axle position. Quick-release Zi:RAK attachments let riders add storage, lights, or other accessories directly to the axle without frame modifications.Replaces standard thru axle with integrated Zi:RAK mounting platform for accessory attachment. Hollow aluminum construction maintains full structural strength and stiffness of original axle. Quick-release Zi:RAK system allows tool-free accessory changes and removal. Available in multiple thru axle standards to fit most modern mountain and road bikes. Adds mounting functionality without permanent frame modifications or.